Strong buying in banking and other select old economy stocks has boosted the market sentiment in mid-morning trades. The Sensex, as a result, has surged by 42 points to 6,693. The Nifty, too, has extended its gains by nine points to 2,093.SBI has advanced 1.63% (Rs 11) to Rs 707. While ICICI Bank, on sustained buying support, has notched up 4% gains (Rs 15) to Rs 387, HDFC Bank is up a notch at Rs 577.Bharti has flared up 4.92% (Rs 11) to Rs 235 on strong buying support.Reliance and HLL are still trading with steady gains at Rs 549 and Rs 147, respectively.Infosys is up a per cent (Rs 11) at Rs 2,192. While Satyam (up Rs 3 to Rs 398) is trading with steady gains, Wipro is down a tad at Rs 675.Gujarat Ambuja and ACC are up a per cent each at Rs 444 (up Rs 4) and Rs 364 (up Rs 2), respectively. Grasim is up Rs 5 at Rs 1,335.ONGC, however, has shed 1.21% (Rs 10) to Rs 854, while ITC has lost a per cent (Rs 10) to Rs 1,328. HDFC has slipped a per cent (Rs 6) to Rs 776.